I read your reference from Wikipedia. Ronald Reagan popularized the 11th Commandment; nobody even knows who the hell Parkinson is or was. And Reagan applied it to EVERY Republican.
I'll ignore your nastiness. For now.
Bravo. However, you still miss the glaringly obvious. First off, Reagan knew very well who Parkinson was, and so did a lot of other people - being the chairman of a state political organization tends to get you noticed, dontcha know - so the mere fact that you have no clue who he was is utterly and totally irrelevant to the purpose behind the 11th Commandment. Second off, Reagan did not consistently apply it and in fact took the gloves off after he got kicked in the kazoo by Ford during the 1976 primaries. That easily puts the lie to your claim that Reagan applied it to everyone; not even Reagan is an unvarnished measure for how to apply the 11th Commandment.
Third off - and back to the main point - everyone, and I mean everyone, back in the day knew who created the 11th Commandment and why he created it: to put the kibosh on the vitriolic attacks of liberal (aka moderate) republicans on anyone who didn't pass their lounge-lizard test (i.e., more conservative republicans). That conservative republicans should acknowledge the 11th Commandment and strive to follow it goes without saying - they are more than capable of rising above their hateful moderate brethren and should do so - but that does not change the basic facts. The 11th Commandment was created to muzzle liberal/moderate republicans, it was not created to muzzle conservative republicans. That is a fact and no amount of whinging on your part will change it. Furthermore, attacks by liberal/moderate republicans on more conservative republicans do substantially more damage to the party as a whole than do attacks by more conservative republicans on liberal/moderate republicans. The republican ecosystem is rife with liberal/moderate republicans who continue to be re-elected time after time no matter how much conservative republicans denigrate them. There are precious few conservative republicans who manage to survive a concerted attack by liberal/moderate republicans, even if - as was demonstrated in Virginia - such a conservative republican enjoys a fairly large degree of approval.
In other words, attacks by conservative republicans on liberal/moderate republicans do not generally threaten the GOP's political positions or the balance of power in Congress because those attacks rarely lead to the electoral defeat of the liberal/moderate being attacked; attacks by liberal/moderate republicans on conservative republicans can be seriously detrimental to the GOP's political positions and the balance of power in Congress because a conservative republican who is rejected by the mainline GOP leadership - who are all liberal/moderate republicans - generally fails to get elected. Again, see Virginia.
These are facts, blunt facts, and no amount of crying on your part will change them. These facts clearly demonstrate not only that the 11th Commandment was intended primarily to muzzle the vitriol of liberal/moderate republicans, they also demonstrate why that was, and is, a very good idea: because intraparty attacks by liberal/moderate republicans do substantially more damage to the party as a whole, and the balance of power in Congress, than do intraparty attacks by conservative republicans.
As for your ignorance, feigned or real, of my "nastiness" - you've got me shivering in my shoes, I can't wait to see what you'll dish out once you get over your ignorance. Come to think of it, you sound an awful lot like a liberal/moderate republican putting on his dutch courage and announcing that, next time, once "we" win, "we'll" take on the democrats and beat them; once we win, then we'll repeal Obamacare, etc, etc, etc, ad nauseam.
Bring it on baby, I'll take some nastiness over your all too real ignorance any day of the week.